Add glyphs for deprecated angle brackets

Add glyphs for deprecated angle brackets

Unicode 15.0 says that U+2329 LEFT-POINTING ANGLE BRACKET and U+232A
RIGHT-POINTING ANGLE BRACKET are deprecated because they're
canonically equivalent to CJK wide angle brackets.  However in a
purely narrow font like Bedstead I think it's reasonable to provide
them and they have AGLFN-assigned names ("angleleft" and "angleright")
that people might still use.  I've make them visually identical to the
more modern U+27E8 MATHEMATICAL LEFT ANGLE BRACKET and U+27E9
MATHEMATICAL RIGHT ANGLE BRACKET.